1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson SA 2010 4 * 5 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson 6 * Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson 7 * 8 * UX500 common part of Power domain regulators 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/err.h> 13 #include <linux/regulator/driver.h> 14 #include <linux/debugfs.h> 15 #include <linux/seq_file.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 19 #include "dbx500-prcmu.h" 20 21 /* 22 * power state reference count 23 */ 24 static int power_state_active_cnt; /* will initialize to zero */ 25 static DEFINE_SPINLOCK(power_state_active_lock); 26 27 void power_state_active_enable(void) 28 { 29 unsigned long flags; 30 31 spin_lock_irqsave(&power_state_active_lock, flags); 32 power_state_active_cnt++; 33 spin_unlock_irqrestore(&power_state_active_lock, flags); 34 } 35 36 int power_state_active_disable(void) 37 { 38 int ret = 0; 39 unsigned long flags; 40 41 spin_lock_irqsave(&power_state_active_lock, flags); 42 if (power_state_active_cnt <= 0) { 43 pr_err("power state: unbalanced enable/disable calls\n"); 44 ret = -EINVAL; 45 goto out; 46 } 47 48 power_state_active_cnt--; 49 out: 50 spin_unlock_irqrestore(&power_state_active_lock, flags); 51 return ret; 52 } 53 54 #ifdef CONFIG_REGULATOR_DEBUG 55 56 static int power_state_active_get(void) 57 { 58 unsigned long flags; 59 int cnt; 60 61 spin_lock_irqsave(&power_state_active_lock, flags); 62 cnt = power_state_active_cnt; 63 spin_unlock_irqrestore(&power_state_active_lock, flags); 64 65 return cnt; 66 } 67 68 static struct ux500_regulator_debug { 69 struct dentry *dir; 70 struct dbx500_regulator_info *regulator_array; 71 int num_regulators; 72 u8 *state_before_suspend; 73 u8 *state_after_suspend; 74 } rdebug; 75 76 static int ux500_regulator_power_state_cnt_show(struct seq_file *s, void *p) 77 { 78 /* print power state count */ 79 seq_printf(s, "ux500-regulator power state count: %i\n", 80 power_state_active_get()); 81 82 return 0; 83 } 84 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_power_state_cnt); 85 86 static int ux500_regulator_status_show(struct seq_file *s, void *p) 87 { 88 int i; 89 90 /* print dump header */ 91 seq_puts(s, "ux500-regulator status:\n"); 92 seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); 93 94 for (i = 0; i < rdebug.num_regulators; i++) { 95 struct dbx500_regulator_info *info; 96 /* Access per-regulator data */ 97 info = &rdebug.regulator_array[i]; 98 99 /* print status */ 100 seq_printf(s, "%20s : %8s : %8s : %8s\n", 101 info->desc.name, 102 info->is_enabled ? "enabled" : "disabled", 103 rdebug.state_before_suspend[i] ? "enabled" : "disabled", 104 rdebug.state_after_suspend[i] ? "enabled" : "disabled"); 105 } 106 107 return 0; 108 } 109 DEFINE_SHOW_ATTRIBUTE(ux500_regulator_status); 110 111 int 112 ux500_regulator_debug_init(struct platform_device *pdev, 113 struct dbx500_regulator_info *regulator_info, 114 int num_regulators) 115 { 116 /* create directory */ 117 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); 118 119 /* create "status" file */ 120 debugfs_create_file("status", 0444, rdebug.dir, &pdev->dev, 121 &ux500_regulator_status_fops); 122 123 /* create "power-state-count" file */ 124 debugfs_create_file("power-state-count", 0444, rdebug.dir, 125 &pdev->dev, &ux500_regulator_power_state_cnt_fops); 126 127 rdebug.regulator_array = regulator_info; 128 rdebug.num_regulators = num_regulators; 129 130 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); 131 if (!rdebug.state_before_suspend) 132 goto exit_destroy_power_state; 133 134 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 135 if (!rdebug.state_after_suspend) 136 goto exit_free; 137 138 return 0; 139 140 exit_free: 141 kfree(rdebug.state_before_suspend); 142 exit_destroy_power_state: 143 debugfs_remove_recursive(rdebug.dir); 144 return -ENOMEM; 145 } 146 147 int ux500_regulator_debug_exit(void) 148 { 149 debugfs_remove_recursive(rdebug.dir); 150 kfree(rdebug.state_after_suspend); 151 kfree(rdebug.state_before_suspend); 152 153 return 0; 154 } 155 #endif 156